390815069 has 2 divisors, whose sum is σ = 390815070. Its totient is φ = 390815068.

The previous prime is 390814987. The next prime is 390815093. The reversal of 390815069 is 960518093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366263044 + 24552025 = 19138^2 + 4955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390815069 is a prime.

It is a super-2 number, since 2×390815069² = 305472836314949522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390815969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195407534 + 195407535.

It is an arithmetic number, because the mean of its divisors is an integer number (195407535).

Almost surely, 2^390815069 is an apocalyptic number.

It is an amenable number.

390815069 is a deficient number, since it is larger than the sum of its proper divisors (1).

390815069 is an equidigital number, since it uses as much as digits as its factorization.

390815069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 390815069 is about 19769.0431989006. The cubic root of 390815069 is about 731.1229785556.

The spelling of 390815069 in words is "three hundred ninety million, eight hundred fifteen thousand, sixty-nine".